Dataset requirements for shear probes: Difference between revisions

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The data format recommended is summarized in [[Netcdf dimensions (shear probes)|standard dimensions]] and shuold include necessary [[Netcdf meta data (shear probes)|meta data]]. ATOMIX provides several [[Benchmark datasets for shear probes|benchmark data sets]] following these guidelines.
The data format recommended is summarized in [[Netcdf dimensions (shear probes)|standard dimensions]] and should include necessary [[Netcdf meta data (shear probes)|meta data]]. ATOMIX provides several [[Benchmark datasets for shear probes|benchmark data sets]] following these guidelines.
 
__TOC__
 
This section provides an overview of the NetCDF format of benchmark dataset for instruments that measure microstructure shear.
 
= Raw timeseries =
<div class="mw-collapsible mw-collapsed" id="raw" data-collapsetext="Collapse" data-expandtext="Expand Raw">
 
[[User:CynthiaBluteau|CynthiaBluteau]] ([[User talk:CynthiaBluteau|talk]]) 19:44, 28 October 2021 (CEST) COuld be collapsible tables or simply bullet lists. Instead of each sublevel into subheadings, they can be in their separate pages.
==Dimensions==
'''Example of collapsible list'''
<ul class="mw-collapsible">
  <li>TIME</li>
  <li>HEIGHT_AS</li>
</ul>
 
 
'''Example of collapsible table'''
{| class="wikitable sortable mw-collapsible"
! Short name
! Standard name
|-
| TIME
| ...
|-
| HEIGHT_AS
| nominal_height_above_seabed
|}
 
 
{| class="wikitable sortable mw-collapsible"
|+ These dimensions are defined for the raw group level but have a caption.
! Short name
! Standard name
|-
| Content
| Goes
|-
| In Here
| Please
|}
 
==Variables==
{| class="wikitable sortable mw-collapsible"
|+ These variables are defined at group level
! Short name
! Long (standard) name
! Dimensions
|-
| Content
| Goes
| In
|-
| Here
| Please
|
|}
 
==Group Attributes (metadata)==
<div class="mw-collapsible"  id="raw_att"  data-expandtext="Expand Raw Attributes" data-collapsetext="Collapse attributes">
===Required===
<ul>
  <li>Att 1</li>
  <li>Att2</li>
</ul>
 
===Optional ===
<ul>
<li>Enter here</li>
</ul>
</div>
 
</div>
 
=Quality-controlled and segmented timeseries=
<div class="mw-collapsible mw-collapsed" id="segmented" data-collapsetext="Collapse" data-expandtext="Expand QAQC timeseries">
 
Insert info here in the same format as [[#raw|Raw]]
</div>
 
=Spectra=
<div class="mw-collapsible mw-collapsed" id="spectra" data-collapsetext="Collapse" data-expandtext="Expand Spectra">
 
</div>
 
=Dissipation=
<div class="mw-collapsible mw-collapsed" id="dissipation" data-collapsetext="Collapse" data-expandtext="Expand Dissipation">
 
</div>

Revision as of 03:38, 5 November 2021

The absolute minimum data set

The absolute minimum signals and information required to estimate the rate of dissipation of kinetic energy consists of:

  • a sampled shear-probe signal,
  • a means of determining the speed of flow past the shear probe, and
  • a means to estimate the temperature of the fluid so that you can determine its kinematic viscosity.

The sampling rate of the shear-probe signal should exceed significantly (by a factor of 2 to 4) the value of 150U, where U is the speed of the flow past the shear-probe. This speed is often called the speed of profiling, even when the probe is fixed in space and the current causes fluid to flow past the shear probe. The value of 150 cpm equals the spatial resolution of the commonly used shear probe.


The desirable data set

A far more desirable, but not absolutely necessary, set of data consists of the following.

  • Two or more shear probes for measurement redundancy.
  • Vibration sensors or accelerometers that are sensitive to the directions of sensitivity of the shear probes.
  • An accurate thermometer.
  • A pressure transducer.
  • A signal that can be used to estimate the speed of flow past the shear probe.
  • Pitch and roll sensors.

Most commonly available instruments carry two shear probes that are frequently oriented so that they measure orthogonal components of the shear and, thus, provide two independent estimates of the rate of dissipation that you should agree statistically.

Recommended data format

For sharing a data set, we recommend to provide four processing levels of data in a single netCDF file per instrument file. The processing levels include

The data format recommended is summarized in standard dimensions and should include necessary meta data. ATOMIX provides several benchmark data sets following these guidelines.

This section provides an overview of the NetCDF format of benchmark dataset for instruments that measure microstructure shear.

Raw timeseries

CynthiaBluteau (talk) 19:44, 28 October 2021 (CEST) COuld be collapsible tables or simply bullet lists. Instead of each sublevel into subheadings, they can be in their separate pages.

Dimensions

Example of collapsible list

  • TIME
  • HEIGHT_AS


Example of collapsible table

Short name Standard name
TIME ...
HEIGHT_AS nominal_height_above_seabed


These dimensions are defined for the raw group level but have a caption.
Short name Standard name
Content Goes
In Here Please

Variables

These variables are defined at group level
Short name Long (standard) name Dimensions
Content Goes In
Here Please

Group Attributes (metadata)

Required

  • Att 1
  • Att2

Optional

  • Enter here

Quality-controlled and segmented timeseries

Insert info here in the same format as Raw

Spectra

Dissipation

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